1.887 Ansichten
Explains that different kinds of soil are mixtures of sand, clay, and humus; tells how the weathering of rocks helps make soil; includes simple experiments to show the kind of soil in which different plants grow well.
Veröffentlichung: Jan 01, 1966
Laufzeit: 10 Protokoll
Sprache:
Studio: Coronet Instructional Films
Land: United States of America
Besetzung:
Besatzung: